Grow Closet

I have this closet its about 4x6 i want to grow 3-4 plants using a 400w mh and a 75w hps light system. I have 4 PC fans and one oscillating fan. My main concern is getting new air into the closet what should i do?

take ashit ina bucket then relase the co2 from the fumes and then reusse the shit for fertilizer your weed will taste like nothing you ever tried

Bring new in, from out of the closet, and push the old air out. Lol, wtf chronic?

~ooli~

I am growing 4 diesel plants in a closet that I made into a small growing area. I am using 1 400 watt MH for veg and then I will switch to a 400 watt HPS for flowering. I have 1 fan inside the closet and another outside the closet to get fresh air in. I have a window that is out of view of neighbors, etc. that I keep open for fresh air. I have the closet lined with mylar to try and get the most light I can. I have only been growing for 10 days but it seems to be going ok so far. Check out my thread.
https://www.rollitup.org/indoor-growing/331890-first-indoor-medical-marijuana-grow.html